TW200834441A - A method of managing number of views, a security processor, and a terminal for performing the method - Google Patents

Abstract

This method of managing the number of views of an audiovisual content comprises: providing a table containing as many cells as there are time segments in the audiovisual content, each cell being associated in one-to-one manner with a respective segment of the audiovisual content; when a segment of the audiovisual content is read, incrementing (114) or decrementing a number contained in the cell associated with said segment by a predetermined step; and calculating (120) the number of views that have already occurred on the basis of the numbers stored in each of the cells of the table.

Description

200834441 IX. INSTRUCTIONS: [Technical Field of the Invention] Field of the Invention The present invention relates to a method of managing views, a security device, and a terminal for performing the method. [Prior Art] Background of the Invention « A method for managing the number of views of audiovisual content exists. By way of example, this specific method includes: 1) providing a digital audiovisual content recorded on a data storage medium, the content being subdivided into a plurality of consecutive time segments automatically read in a prescribed order; One of the audiovisual content is allowed to be viewed; • The recorded audiovisual content is read through the turtle picker device, and the electronic reader causes the electronic reader to jump to read before the end of the audiovisual content has arrived An earlier time segment is possible; • calculating the number of views that have occurred for the audiovisual content; and • preparing the number of views that have occurred greater than or equal to the number of allowed views 4, preventing any further viewing of the audiovisual content, otherwise , Yun 2 allows the entire audiovisual content to be viewed again. By way of example, the digital audiovisual content can be a videogram such as a movie or a television broadcast. A segment corresponds to a sequence of sequential and continuous images and/or sounds. The clip is recorded in the form of 5 200834441 suitable for reading by an electronic reader and then being viewed on a screen. During viewing on the screen, the images and sounds of a segment follow each other at a frequency greater than or equal to 50 Hertz (Hz), such that between the various images and sounds in a slap in the slap. Establish effects for visual and auditory continuity. If the two segments are read in the prescribed order, the time difference between the instant at which the previous segment stops being played and the instant at which the subsequent segment starts being played is less than 1/50 second, and the two segments are regarded as continuous. Therefore, for the user, the visual and auditory continuity between the two segments is ensured for the user. 10 15 20 This method is particularly useful in limiting the number of times a user can view a recorded audiovisual. So far, it should be observed that the audiovisual content can be broken by the number of times the money has been calculated to count the number of times the viewer has turned to the visual content. This first method should be parallel to the second method area, and the second method likewise seeks to limit the content to be viewed. This parallel method will initially allow - viewing during the dva. Thereafter, the period ^VA is deducted from the proportion of the length of the audiovisual content that has been viewed. This parallel method is simple because it is sufficient to measure the viewing time. However, it is not flexible enough, and especially if it is difficult to see the wide range of audiovisual content by simply measuring the total amount of time that has disappeared, it may include the possibility of watching audiovisual content. Go back to Tao Yue, or vice versa, where the jump can be executed under the control of the user, and the number of the audiovisual content is counted as a slave, and the number of times is avoided. The shortcomings of the 仃 method. However, because it is possible to split the K main jump, and perhaps there may be 6 200834441 ^ 5 may jump forward, there are many different strategies that can be used to calculate the number of views that have occurred. For example, once each segment of the audiovisual content has been viewed at least once, the audiovisual content can be determined to have been viewed once. This strategy is very tolerant because it enables the user to watch the clip indefinitely as he or she wants to jump back and forth each time a particular clip is viewed. A somewhat less tolerant strategy involves incrementing-counting each time a segment of the visual content is viewed. The count is then 10 compared to a predetermined threshold. If the threshold is exceeded, the number of views that have occurred will be incremented. According to this strategy, the user can no longer watch a particular segment as many times as desired without the increased number of views being considered. However, conversely, the number of views that have occurred may be increased, even if some of the segments are not viewed at all. Therefore, it is desirable to propose a method of managing the number of views that is flexible enough to be implemented using a new strategy for calculating the number of views that have occurred without causing significant modifications to the method. SUMMARY OF THE INVENTION 3 20 SUMMARY OF THE INVENTION The present invention seeks to satisfy this expectation. Accordingly, the present invention provides a method of managing the number of views of an ordered audiovisual content, the method comprising: • providing a table containing a number of cells corresponding to the number of time segments, each of the cells being one to one The mode is connected to the audiovisual content 7 200834441 slice 1 , each cell is suitable for containing a number; • when a segment of the audiovisual content is read by the e-reader, the package is The increment or decrement of the number in the cell associated with the segment is a predetermined step; and _ 5 • The number of views that have been generated is calculated based on the number stored in each cell of the table. In the above method, the table makes it possible to store a representation of the number of times each segment of the audiovisual content has been viewed by φ. Specifically, the contents of the form can also be reversed. The granularity of the information contained in the table is therefore sufficient to implement a large number of different strategies to calculate the number of views that have occurred. This method is therefore flexible enough to enable each operator or provider of audiovisual content to define their own strategy for calculating the number of views that have occurred. ~ However, if there is a change in the calculation strategy, there is a need to change, there are ten ways to view the number of views and/or the predetermined size of the increase or decrease of 31, and there is no need to modify the management. Operation or the: Secret update. Therefore, the correction method that this management method needs to be provided is limited. Implementation of this method may include one or more of the following characteristics: 20 • Storage in a lost memory - a multi-view license that includes at least: • the number of views allowed; • the form, a cell comprising a pair of patterns associated with respective segments of the audiovisual content; and 8 200834441 • cryptographic redundancy, which uses a cryptographic key and each of the above data items At least a portion of which is implemented; • verifying the password redundancy each time the reader is newly used to view the audiovisual content; and • preventing any further viewing if the verification of the redundancy of the password fails • The license includes an identifier (T-Anti-Reuse) for its previous use; 0 • One of the information storage devices is installed to hold the processor, the information storage device contains: • Can be used to verify the license password One of the redundant cryptographic keys and/or one of the cryptographic keys that enables the license password redundancy to be implemented; and • an identifier previously used by the license 1 5 C Anti Reuse ;

• After each use of the reader to view the audiovisual content, the identifiers T-Anti-Reuse and C-Anti-Reuse are modified to match their respective new values; and • at each time Reusing the reader to view the audiovisual content before the 'only when the value of the identifier τ_Anti_Reuse corresponds to the value of the identifier C-Anti-Reuse, the viewing of the audiovisual content will be approved; The method includes selecting an algorithm for calculating the number of views that have occurred. When calculating the number of views, the algorithm is executed as a function of the license content, and the algorithm is selected from a group of different The fact that the two noses are 1U, which is produced by 9 200834441, will produce different results for the early content of the table. In the case of 'Bei, the second computing algorithm is regarded as Different; • provide most different audiovisual content and most licenses up -5 „ — audiovisual content identifiers, the audiovisual content identifiers such as one-to-one • mode and the single of the audiovisual content And; when calculating the amount of money that has occurred, only certain information will be asked to count the number of views that have occurred, and that particular information is included in the license containing the identifier of the currently read audiovisual content. 10 • Provision-to-hold processing 11, which applies to the entitlement control message (ECM) and entitlement management messages (EMM). and • in the form of a rights management message The license is transmitted to the security processor, and the rights management message includes an identifier of the only device that is transmitted to it; • different segments of the audiovisual content are scrambled differently: control word, The method for each of the segments includes: • transmitting at least one rights control message to a security processor, each rights control information comprising: • • the control needed to understand a portion of the slice of the visual content for descramble a password for the word; and an identifier corresponding to the object when the right control information is used to retrieve the visual content The square of the form that will be incremented or deducted when the control word required for the segment is increased; 200834441 • The number of the number included in the single box is increased or decremented, and the single cell corresponds to The identifier in the rights control information; the security processor decodes the control word included in the transmitted rights control; and • transmits the decoded control word to a descrambler to resolve the audiovisual At least a portion of the segment of content; • Calculating the number of views that have occurred includes: • Judging from the total number of cells in the table that have been incremented or decremented since the last time the view was viewed. And • the number of views that have occurred δ is a function of the result of the decision, and • when calculating the number of views that have occurred, the increment or deduction is included in the number in the cell associated with a segment. The predetermined pitch is reduced or increased by a function that is the number of times the segment has been viewed. The above implementation of this method presents the following advantages: • Retaining the information needed to calculate the number of views that have occurred in a signed license makes it very difficult to falsify this information; • Compare the identifiers T-Anti-Reuse and C- Anti-Reuse prevents a license from being reinitialized into a previous state; • the possibility of selecting different algorithms for calculating the number of views that have occurred has made it possible to use different strategies for monitoring the number of views of various audiovisual content; • The use of an audiovisual content identifier in each license makes it possible to independently manage the viewing times of such audiovisual content; 11 200834441 • Transferring the license limit in the form of a rights management message requires the security processor to be done Adaptation that enables the security processor to receive and process the license; • the presence of a single identifier that is to be incremented or decremented in the entitlement control information 5 containing the control word password Greatly interpolating the rules of the form for the security processor; • to see when the audiovisual content was last viewed The form has been modified by one of the number of single-numbered functions to increase the number of views that have occurred to allow consideration of the proportion of the audiovisual content that has been viewed, in order to increase the number of views that have occurred or to reduce the number of viewers; and • change The size of the increment or subtraction is used as a function of the number of times the viewer has been viewed to assign different degrees of importance to the first viewing of a segment and the subsequent viewing of the same segment. The present invention also provides a security processor including instructions for performing the above-described management method when the instructions are executed by an electronic computer. Finally, the present invention also provides a terminal for reading an audiovisual content, the terminal comprising: • a data recording medium containing the recorded digital audiovisual content, the content is subdivided into a plurality of consecutive time segments, To automatically read in a predetermined order 20; • the audiovisual content is allowed to view an integer number of times; .- audiovisual content e-reader, which can specifically jump back to read a read before the end of the audiovisual content Earlier clips • • Terminals are suitable for: 12 200834441 • Calculate the number of views that have occurred for the audiovisual content; and • Prevent any new viewing of the audiovisual content if the number of views has been greater than or equal to the number of allowed views, Otherwise allowing the entire new viewing of the audiovisual content; 5 • The terminal then includes a form containing a number of cells corresponding to the number of time segments, each of which is in a one-to-one manner and one of the audiovisual content Fragments are associated, each single cell is adapted to contain a number, and • the terminal is adapted to: • when one of the multimedia content When the segment is read by the e-reader 10, it is used to increment or decrement the number contained in the cell associated with the segment by a predetermined level; and • to use each table stored in the table based on The number in the grid, which counts the number of views that have occurred. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be more readily understood from the following description, which is presented by way of a non-limiting example, It displays a terminal for reading the recorded digital audiovisual content; 20 Fig. 2 is a diagram representing the audiovisual content that can be viewed by the terminal of Fig. 1; Fig. 3 is a diagram, It represents one of the rights control information (ECM) recorded with the audiovisual content of FIG. 2; FIG. 4 is a diagram representing a 13 200834441 license used in the terminal of FIG. 1; Figure 5 represents the "table" included in the license of Figure 4. Figure 6 represents an Anti-Reuse list contained in the 1st processing cry of the terminal of Figure 1; Figure 7A and the stream of time To manage the number of times the audiovisual content has been viewed; the brother 8 is a diagram representing a unique (10) M-U structure, which is produced during the execution of the Dinar, and 10, 9th through 11th Diagram flow chart, each representing three algorithms, 1 is used to calculate the number of views that have occurred . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, the same reference numerals are used to refer to the same elements. 15 In the following description, features and work well known to those skilled in the art have been known.

Can not be described in detail. Figure 1 shows a terminal 2 for reading digital audiovisual content. The S final 'machine 2' is adapted to cause a screen 4 to display the viewed audiovisual content, the display being presented in a manner that enables the audiovisual content to be viewed by a user. The term "user" is used here to mean a human being. By way of an example, the screen 4 is typically a television screen. The terminal 2 includes a decoder 6 which is connected to a data recording medium 8. For example, by way of illustration in this example, the two audiovisual content CANi and CAN2 and their respective licenses ^^ and 1^ are recorded on the media 14 200834441 8. By way of example, the content is an audiovisual content that is mixed with the help of the control word CW. The architecture of one of these audiovisual content is shown in Figure 2. The audiovisual content is finely divided into a plurality of time segments CAN_1 to 5 CAN-N. These segments CAN_i are connected to each other in a specified order. Lift

For example, the segment CAN_1 corresponds to the first segment to be read, and the segment CAN_N corresponds to the last segment to be read. In this example, each segment CAN_i is coded using a single control word CW, which is different from the segment used to mix the previous or subsequent segments. Thus, in this particular embodiment, each segment corresponds to a cryptoperiod. By way of example, the duration of the crypto period is typically 1 sec. Each segment of the crypto period CANj is linked to an Entitlement Control Message (ECM), which is written as an ECM. The message ECMj includes a control word (:: a password cw* of the hips. The message ECM-1 is associated with the segments CAN) is recorded on the medium 8 by using the control word of the segment CAN_i. For example, the architecture of these messages ECM-i follows (4) C9〇_〇〇7 standard "Conditions access 2〇f〇T dl§ltal broadcast systemsj", such as satellite The long-distance data transmission network of the network transmits the field of mixed-code multimedia signals. ♦; The following descriptions of the ECM_i message architecture that are helpful are: Ί λ has been ”, the staff does not. The message ECMj includes Field S0ID, which contains - an identifier of each operator who broadcasts the audiovisual content 15 200834441 and an identifier of the cryptographic context to be used. The cryptographic context to be used The identifier is specifically used to enable a security processor to identify which cryptographic key(s) should be used to process the ECM message. 5 The message ECM_i also includes: • A field C-Id containing a table One of An identifier C_Id of a single cell (ceu); • a CW*, a password CW* containing a control word cw; • a field CdA containing the access condition cDA of the audiovisual content; 10 and An intercept ECM_R containing a cryptographic redundancy, such as a message authentication code (MAC) or a cryptographic signature of the message ECMj, the cryptographic signature being associated with a portion of the information contained in each of the previous cells of the message ECM__i 15 The identifier C_Id establishes a one-to-one relationship between the message ECM j and a single cell in the table of Figure 5. By way of example, the licenses 1 and B have the representations in Figure 4 The license structure in the middle. More specifically, each license includes the following fields: • A barrier S0ID has the same S0ID in the connection message ECM-i corresponding to the content of the audiovisual 20 corresponding to the license. Content; • a barrier UA that contains a unique identifier UA of a security processor; • a barrier Content_Id that contains an identifier of the audiovisual content corresponding to the license Content Id; 16 200834441 • Field L-Id, which contains one of the licenses identified L_Id, the identifier L_Id is used to distinguish the license from another license containing the same identifiers SOID, UA and Contentjd; • a field NVA, which corresponds to the audiovisual One of the number of times the content is permitted to read 5 is a positive integer NVA, the audiovisual content is identified by the identifier Contentjd; • a field NCV containing an integer NCV that is used to store the license The segment number of the audiovisual content that has been viewed when the audiovisual content was previously read; 10 • A T-Anti-Reuse, which contains an identifier T-Anti-Reuse used before the license, Ensure that the same license cannot be reused multiple times; usually this identifier is a numeric number that is only increased for each new use of the license; • One field Params, which contains various parameters of an algorithm For the number of views that have occurred 15; • a block Tab containing the table of Figure 5; and • a block L-R containing a password redundancy r such as a MAC, or = included in the above field Information in each At least - one of the relevant part of the cryptographic signature (cryptographic signature). 2〇 By way of example, this field Params contains values for the following parameters: • Dimensions; • S!; • S2; and • Algo Id 〇 17 200834441 The purpose of these parameters is described below with reference to Figures 9-11. The cryptographic redundancy L-R is constructed by implementing a cryptographic algorithm and a cryptographic key. Figure 5 is a diagram of an architectural example that can be used in the Tab. 5 In this example, the table consists of N consecutive cells, which are classified as ! Qing. N-line - an integer equal to the number of segments included in the audiovisual content associated with the license. Each of the cells acts to contain a number, which is encoded by a number of bits, which can be set by using the parameter c-Size contained in the field Params of the license. 1) The values 1, 2, 3'", 1, 1+b~, :^ indicated above for each of the cells represent the value of the identifier (:;-;^), It acts to identify the unit immediately below. The decoder 6 comprises: • an electronic picker 10 adapted to read and write data to the 15 media 8; • a filter 1 § 12, Suitable for transferring the mixed-coded audiovisual content to a de-mixing code as a decoder, and transmitting the message ECM-I to a decoder 7 card interface 16 associated with the mixed-coded audiovisual content; and A decoder and decoder 14. 2 is purely unintentional. In this example, the decoder 6 includes a receiver adapted to receive the content of the mixed audiovisual content through the wireless data transmission network. And the ECM messages associated with the audiovisual content. For example, the shuffled audiovisual content and the ECM messages are transmitted by a remote transmitter 24 to a plurality of remote terminals such as the terminal 2. 200834441 Terminal 2 also has a security processor 30' that is connected to the decoder 6. This security processing The 30 series is designed to handle the ECM messages and EMM messages (rights management messages) and the encoding and decoding operations required to perform the operations of the terminal 2. 5 For this purpose, the processor 30 comprises: • an interface 32, adapted to cooperate with the interface 16 of the decoder to receive ECM and EMM messages therefrom; • a computer 34 adapted to process the EMM and ECM messages received via the interface 32; 10 • Non-volatile The memory 36, in which various items of data required for the encoding/decoding operations are also stored; and a volatile memory 38 to which temporary processing results are stored. For example, the processor 30 It is a mobile processor such as a smart card. 15 The memory 36 contains:

• A unique identifier UA is given to the security processor 30, enabling the processor 30 to be discerned from all other security processors that may be used by the decoder 6; and • three different algorithms Algol, Algol And Algo3, each of which is used to calculate the number of views that have occurred. For each identifier of the cryptographic context, the memory 36 also includes the following information: • Access rights TdA for comparing with the access conditions CdA included in an ECM message, whether the ECM message can be determined It is buried by the process 19 200834441; • a list CAR' is used to prevent reuse of a license; and • a password key Κ ρ is used to enable the processing of the eCM and emm messages These encoding and decoding operations are performed. Figure 6 shows an architectural example that may be used for this list CAr. By way of example, the list includes a first line containing one of the identifiers C〇ntent_jd and a second line including the identifier C-Anti-Reuse associated with the identifier c〇ntent_Id. The list CAJl contains as many columns as the licenses that have been read by the read machine 10. Weng's memory 36 also includes a table, TabIncrement, for use with the algorithm Alg〇3. By way of example, the table TabIncremem is shown below:

The first column X of this table contains integers, each of which corresponds to the number of times a segment has been renewed. The second column Y is associated with each of the integers to an increment that should be observed. In this example, the increment is a monotonically decreasing function. Z provides a number for each segment of a segment, and the algorithm actually lists 20 numbers. Finally, the terminal 2 includes a remote control 40 that enables the decoder 6 to be controlled by the wireless link 42. In order to simplify the explanation, the remote control only has 20 200834441. The following buttons are displayed: • a button 44, which acts to trigger the reading of an audiovisual content selected from various audiovisual contents recorded in the medium 8; • A button 45 that enables the reading of the audiovisual content to be stopped, for example, 5 to switch to reading other audiovisual content, or simply to stop all readings; • a button 46 that uses the previous back jump, That is, to jump directly from a segment currently being read to a previous segment, without having to read 10 intermediate segments between the segment currently being read and the previous segment for this purpose; and • a button 47 It uses the previous jump, that is, allows the segment currently being read to be directly switched to a later segment without having to read the intermediate segment between the segment currently being read and the later segment. The operation of the 5th end and the machine 2 will be described below with reference to the method of Fig. 7. Initially, during a step, the transmitter 24 transmits a coded audiovisual content and its corresponding ECM message to the terminal 2 via the network. During a step 72, the terminal 2 records the coded audiovisual content and the corresponding ECM message on the medium 8, for example, to obtain the method of taking the audiovisual content CAN1i. Thereafter, during a step 74, the transmitter 24 transmits the license to the terminal 2 via the network 2 or through other modes of communication. This is the original version of the license and, in particular, it contains the original number of NVAs for which the content was allowed to be viewed. Preferably, the original value enables the content to be viewed completely at least twice. For example, during step 74, 21 200834441, the license is transmitted in an EMM_U message, which is shown in the architecture of Figure 8. More specifically, the architecture of this EMMJJ message follows the above-mentioned standard Ute C90-007 in the field of transmitting coded multimedia signals. In Figure 8, only the five components required to understand the description below are shown. More specifically, the EMM-U message has the same block as described above with reference to Fig. 4, so that it is not necessary to describe them again in detail herein. During a step 76, only the terminal 2 having the security processor corresponding to the one of the identifiers UA is recorded to record the receipt of the media 8 . It should be understood that the license may be transmitted prior to the content or may be transmitted concurrently with the content, and as such, it may be recorded on the media 8 prior to or simultaneously with the content. Thus, steps 70 and 74, as well as steps 72 and 76, may be simultaneous or alternating as long as step 72 and step 76 are each maintained after steps 70 and 74.

Subsequently, the user of the terminal 2 induces reading of one of the audiovisual contents recorded on the medium 8, for example by using the remote control. In this example, it is assumed that it is reading the induced content CANl. Next, a phase 80 called session opening begins. 20 Initially, during a step 82, if a majority of the license exists for the same audiovisual content, the user selects which license to use to view the content. In this example, the license L! is automatically selected because this is the only license associated with the content CAN. Thereafter, during a step 84, the terminal transmits through the interfaces 16 and 22 200834441

32 transmits the selected license to the processor 3〇. For this purpose, the solution uu transmits the emm-U message representing the license, and the EMM_U is the same as that shown in Fig. 8. During a step 86, the processor 3 verifies that the identifier UA included in the received -5 EMM-U message corresponds to the identifier UA recorded in the memory 36. For example, during a step 86, the processor 30 verifies that the identifier UA is the same. ^ If so, it proceeds to a step 88 during which the processor 30 verifies the authenticity of the received license by means of the cryptographic redundancy. More specifically, during a step 88, the processor 30 performs an operation similar to that previously performed on the content of the fields that are received for verification to obtain redundancy L-R. Specifically, during step 88, at least one of the operations includes encoding or decoding using a weight key. For example, the cipher key used for cryptographic redundancy is identified by the next one of the context identifiers included in the 15 SOID field of the message. If the code redundancy processing performed by the processor causes a positive effect, for example, if: the processor 30 constitutes the redundancy system and the redundancy included in the barrier L-R is the same Then, the license is considered to be true and honest, and the process is performed by step 90. 20 During a step 90, the processor 30 searches for the identifier C_Anti_Reuse, which is associated with the identifier Content_Id included in the received license. If there is no identifier in the list CAR, it corresponds to the received identifier.

If Content-Id, then the processor 30 performs a step 92, step 92 23 200834441 adds the received identifier Content_Id to the list 0-8, and associates the identifier to have one of the original values of zero. C Anti Reuse. Otherwise, during a step 94, the processor 30 compares the value of the identifier T_Anti_Reuse that was received and verified with the list CAR

The identifier Content_Id is associated with the value of the identifier C_Anti_Reuse. If the identifiers correspond, for example, if their values are equal, then, during a step 96, the processor 30 verifies that the digital NVA contained in the received license is completely greater than zero. If yes, then during a step 98, the processor 30 stores the following data in its memory 38: the parameters contained in the field Params, the numbers NVA and NVC, and the inclusions received therein. The form of the permit is dip. If the verification performed during step 86, 88, 94 or 96 fails, then the processor 30 will immediately perform a step in which it 15 stops processing the received license and stops decoding the mixed content audiovisual content. 0 At the end of step 98, the phase 80 is completed and the phase 104 of reading the audiovisual content is automatically started. At the beginning of stage 104, during a step 〇6, the first segment CAN-1 of the audiovisual content 2〇CAN! is read and transmitted to the demultiplexer 14. At the same time, during a step 108, the associated message ECM-1 is transmitted to the processor 30. Thereafter, during a step 110, the access conditions CdA included in the message are associated with the access rights included in the memory 36 200834441

Comparison of TdA. When the access conditions correspond to the access rights TdA, then the method continues with a step 112 in which the identifier CJd included in the received message ECM-1 is obtained. Then, during a step 114, the processor 3 increments the first level of the specified size for the single cell corresponding to the acquired identifier C_Id in the received form 5 Tab. In this example, the specified step size depends on the parameter Algo_Id. This step 114 is only executed if the cell has not reached the maximum size specified by the identifier C_Id. During a step 116, the processor 30 also increments the digital NCV by a specified level of 10. Subsequently, during a step 120, the processor determines if the audiovisual content has been viewed another time. This is done by executing the algorithm corresponding to the identifier Algo-Id. The algorithms corresponding to the identifiers Algob Algo2 and Algo3 are each described with reference to Figures 9 through 1511. If the content has been viewed again once, the processor proceeds to a step 122 during which the digital NVA is incremented and, if necessary, the table Tab and the digital NVC are updated. During a step 124, the processor 3 verifies that the digital NVA is 20 or more than zero. If the digital NVA is still completely greater than zero, then during a step 126 'the processor proceeds to retrieve the password CW* in the received message ecm_1 and then stores it in the context with the block S0ID The content associated with one of the decode keys decodes the password. Subsequently, during a step 128, the decoded control key CW is transmitted to the descrambler 25 200834441 14 if the received access condition does not comply with the stored access right during step 110, or If, during step 124, the number nva is less than zero or equal to zero, then the processor 3 immediately proceeds to a step 5130, which stops processing the received message. Therefore, no new (four) word CW will be provided to the descrambler, thereby preventing the proper copy code from being recorded on the audiovisual content of the medium 8. If, during step 120, no new viewing has occurred, then the method proceeds directly from step 12 to step 126. 10 纟 At the end of step 128, the descrambler 14 decodes the segment CANj by using (10) the control received from the processor 30. Subsequently, during a step 134, the deserialized code segments are clearly displayed on the screen 4. At the end of step 134, the method automatically returns to step 1〇6 and step 15 1〇8 to read the segment from the listening content CAN#. When there are no buttons 46 and 47 to cause a forward or backward jump, for each of the segments CAN1-I of the content CAN!, the steps 1〇6 to 13 4 are re-ordered according to the sequence of the special segments. Executed. During this phase 104, the user can also use the buttons to correct the 叼 20 back or jump. Under such conditions, the segments of the content CAN! are no longer read in the prescribed order. Nonetheless, these steps 1〇6 through 134 continue to be applied to each segment being read. In other words, the use of the buttons 46 and 47 does not end the current read period (sessi〇n). After the viewing valley has been viewed, the user may decide to view the 2008 200841 bundle, for example by pressing the button 45. At that moment, the processor 30 then proceeds to a stage 140 to end the current session. At the beginning of stage 140, during a step 142, the processor 30 increments to form a number of the identifier C_Anti_Reuse, the identifier c_Anti_Reuse being associated with the identifier c〇ntent_Id in the list CAR Union. Thereafter, during a step 144, the processor generates a just-updated license, i.e., the updated final certificate includes new values for the numbers NVA, NCV, T_Anti_Reuse, and Tab, and a re-formed value! ^^. The value 10 of the identifier T_Anti_Reuse in the updated license is the same as the following: the identifier C_Anti_Reuse is associated with the identifier c〇ntent_Id in the list CAR. The redundant L_R is formed from the new value in the voucher and is used by using the appropriate cipher key stored in the context associated with the identifier S0ID. 15 Thereafter, during a step 146, the processor 3 transfers the updated license 1 to the decoder 6, which stores it in place of the license previously stored on the media 8. An example of three algorithms is described below, which are used to calculate the number of views and are suitable for being implemented in step 120. Each algorithm is assigned 20 to a specific value of the parameter Algo~Id contained in the license. Figure 9 represents the algorithm Alg〇1 used to calculate the number of views that have occurred. The algorithm Algol uses the two parameters contained in the license, i.e., the threshold Sju, the parameter C-Size. In order to execute the algorithm Aig, the parameter is set to one bit. 27 200834441 During the implementation of the algorithm Algol, during a step i5, the processor 30 detects a discontinuity in the purchase of the audiovisual content ί. For example, the detection of this discontinuity may be by one of the buttons that are pressed in response to the buttons 46 and 47. The discontinuity can also be used to observe discontinuities in the values of the identifiers c_Id included in the received message ECM_i. Thereafter, when such a discontinuity is detected, during a step 152, the processor 30 regards the audiovisual content as having been viewed at a new time, if a "1" is included in the table Tab. The number of cells is greater than or 10 is specific to a critical value Si. If so, during step 122, the numeric NVA is decremented by one, and all of the tabs of the Tab in the table are re-initiated to zero. This step 152 is also automatically performed when the end of the last segment of the audiovisual content is reached. 15 The algorithm Algol allows a portion of the content whose size is limited by the threshold 81 to be viewed repeatedly, but the number of views is limited when the size of the viewed portion of the content is greater than the threshold. The first diagram represents the algorithm Alg〇2 used to calculate the number of views that have occurred. The algorithm Algo2 utilizes the parameters 20 C-Size, S+S included in the license. During a step 160, such as with step 150, one of the discontinuities of audiovisual content reading is detected. In response to this, during a step 162, if the number of cells containing a "1" in the table Tab is greater than the threshold Si, or if the number NCV is greater than or equal to the threshold S2, it is determined 28 2834441 It has happened in a new occasion. During this step 122, when it is determined that a new viewing has occurred or the last segment has been read, the number NVA will be decremented by one, and all the cells of the table Tab and the numerical value of the number NVC will be restarted. Initialize to this 5 value. The algorithm Alg〇2 differs from the algorithm Algol in that it uses the use of the threshold value S2 to limit the viewing of a limited segment of the content. Figure 11 represents the algorithm Algo3. The algorithm Algo3 uses the same reference S2 of the received license. In addition, the identifier of the algorithm Algo3 10 notifies the processor 30 that the increment level used in step 116 is determined by the table Tab. Then, during a step 170, the processor 30 detects a discontinuity in the viewing of the audiovisual content. Then, in response to such a test or at the end of the last segment view, during a step 172, if the digital NCV is greater than the threshold I, a new view is determined to have occurred. If so, then during step 122, the digital NVA is decremented by one, and the digital NCV and the secret vouchers (four) are reinitialized to zero. It should be observed that in this third algorithm, when a segment is viewed, the number + NCV is incremented by one. Conversely, when the same segment is viewed 20 times for the second time, the digital NCV will only be 増5. Then if the same segment is viewed more times, the increase used during this step i 16 will be smaller. Thus, by this technique, subsequent viewing of a particular segment is given less importance than the first viewing. There are many other implementations that are feasible. For example, the license can be transmitted to the decoder from the 2008 200834441 transmitter and then transmitted from the decoder to the security processor using messages other than the 7EMM u message. For example, any signature data structure can be used. The security processor 30 is described above as a mobile processor. In a variation, the processor 30 can be integrated into the decoder 6 and permanently incorporated therein. In a variant, the license does not contain the intercept L-R and is therefore not protected by a signature. When there is only one license for each audiovisual content, the block L_μ can be omitted. When there are a large number of licenses for the same audiovisual content, the license license to be used is automatically selected. For example, the oldest license may be preferred. In this example, each segment corresponds to a password period (crytoperiod). In one variation, a segment may correspond to a majority of consecutive dense 15 code periods. In this case, most ECM__i messages will include the same identifier Cjd. In another implementation, the single box of the table Tab can be derated rather than incremented. In the implementation of the table Tab that is never re-initialized, the field NCV can be omitted. The license may also be versatile for most audiovisual content recorded on the media 8. In this case, the identifier Content_Id does not recognize a single audiovisual content, but identifies a group of audiovisual content that can be viewed through the terminal 2. Certain steps of the method of Figures 7A-7B can be exchanged. For example, step 110 30 200834441 can be performed after step 124. In this case, monitoring the number of views that have occurred will occur after each segment is read. In a variation, monitoring can only be performed at the end of the session. Therefore, in this implementation, nothing will prevent a user from viewing a current audiovisual content as many times as he desires in a single period. However, the number of times during this period is limited. In the simplification, the increment level used by the algorithm can be provided by the parameters of the ECM message to account for differences in the degree of interest for different parts of the content. 10 The job 8 can be a removable body, for example, a rewritable digital video disc (DVD-RW) or a __ rewritable disc (CD_Rw). It can be a removable medium (DVD_R, CD_R) that cannot be rewritten, in which case the license is stored in one of the non-volatile memories of the electronic reader. The above description of audiovisual content can also be applied to content that is only audio and 15 has no video. The description of the description of the audiovisual can also be applied to the content in a local area or local network controlled redistribution 〇 [schematic description] 20 first picture is a picture ' Displaying a terminal for reading a recorded digital audiovisual content; FIG. 2 is a diagram showing the audiovisual content that can be viewed by the terminal of the first drawing; FIG. 3 is a diagram Representing one of the rights control information (ECM) recorded by 31 200834441 together with the audiovisual content of FIG. 2; FIG. 4 is a diagram representing a license used in the terminal of FIG. 1; Represents the architecture of a table contained in the license in Figure 4; _ 5 Figure 6 represents one of the security processors included in the terminal of Figure 1

Anti_Reuse list; Figures 7A and 7B are flowcharts of a method implemented in the terminal of Figure 1, which is used to manage the number of times the audiovisual content has been viewed; ^ Figure 8 is a diagram, It represents the architecture of a unique address rights management message 10 (EMM-U), which is generated by the execution of the message in Figure 7, and the flowcharts of Figures 9 through 11 representing three algorithms. , etc., is used to calculate the number of views that have occurred. [Main component symbol description] 2 terminal 20 wireless data transmission network 4 screen 24 remote transmitter 6 decoder 30 security processor 8 data recording medium 32 interface 10 electronic reader 34 computer 12 filter 36 non-volatile Memory 14 decoder 38 volatile memory 16 decoder / card interface 40 remote control 18 receiver 42 wireless link 32

200834441 44 button 45 button 46 button 47 ugly 70 step 72 step 74 step 76 step 80 stage 82 step 84 step 86 step 88 step 90 step 92 step 94 step 96 step 98 step 100 step 104 stage 106 step 108 step 110 Step 112 Step 114 Step 116 Step 120 Step 122 Step 124 Step 126 Step 128 Step 130 Step 132 Step 134 Step 140 Stage 142 Step 144 Step 146 Step 150 Step 152 Step 160 Step 162 Step 33 200834441 170 Step 172 Step

Claims (1)

200834441 10 15 20 X. Patent application scope: 1. A method for managing the number of views of an audiovisual content, the method comprising the following steps: • supplying a digital audiovisual content recorded on a data storage medium, the content is fine Segmented into a plurality of consecutive time segments for automatic reading in a predetermined order; • providing the number of viewings for which the audiovisual content is permitted; • reading the recorded audiovisual content using an electronic reader device, the electronic reader specific The ground makes it possible to jump forward to read an earlier segment before reaching the audiovisual content result; • calculate the number of views that the audiovisual content has occurred; and • the number of views that have occurred is greater than or equal to the number of views When the number of views is allowed, the viewing of the audiovisual content is prevented from being further viewed, otherwise the audiovisual content is allowed to be viewed again; the method is characterized in that it comprises the following steps: • providing a table containing the same number of time segments Single cells, each single cell is associated with a separate segment of the audiovisual content in a one-to-one manner' A single cell is adapted to contain a number; • when a segment of the audiovisual content has been read by the electronic reader, the number of digits included in the cell associated with the segment is incremented or decremented by one predetermined Span; and • Calculate the number of views that have occurred based on the number stored in each of the cells in the table. 2. The method of claim 1, wherein the method comprises the following step 35 200834441. Storing a multiple viewing license in a non-volatile memory, the license comprising at least: • allowed views 5 • the form containing the cells associated with the time segments of the audiovisual content in a one-to-one manner; and • password redundancy, each through the use of the key and the above data items At least a portion of the implementation is implemented; • verifying the password redundancy each time a new reader is used to view the audiovisual valley; and • preventing the password redundancy from failing in the event of verification failure Any further viewing. 3. The method of claim 2, wherein the license includes one of its earlier identifiers, 15 T-Anti-Reuse; • a security processor, which is equipped with information storage containing the following Means: • A password key used to verify the password redundancy of the license and/or the password redundancy enabling the license is implemented with a password 20-key-password key; • Early use of the license One of the identifiers C-Anti-Reuse; • Each time the reader is used to view the audiovisual content, the identifiers T-Anti-Reuse and C"Vnti_Reuse are changed so that 36 200834441 their respective The new value corresponds to; and • before each new use of the reader to view the audiovisual content, only when the value of the identifier T_Anti_Reuse corresponds to the value of the identifier C_Anti_Reuse, the viewing of the audiovisual content Will be allowed. 5 4. The method of claim 1, wherein the method comprises selecting an algorithm for calculating the number of times the view has occurred, and calculating the number of views is performed as a function of the content of the license. The algorithm is selected from a plurality of different operational algorithms that can be executed. If the second algorithm results in a different result of the single cells of the table for a content, the second algorithm is considered different. 5. The method of claim 1, wherein the method comprises: • providing a plurality of different audiovisual content and a plurality of licenses, each of the licenses having an audiovisual content identifier, which is one-to-one The method is associated with a single person of the audiovisual content; and 15 • When calculating the number of views that have occurred, only the following information is used to calculate the number of views that have occurred: being identified by the audiovisual content that is currently being read The information contained in this license. 6. A method of applying for any of the scope of the patent, wherein the method comprises: • providing a security processor adapted to process rights control information (ECM) and rights management messages (EMM); and managing rights The message format transmits the license to the security processing state, the rights management message including an identifier of the single security processor to which it is designated. 7. The method of claim 1, wherein the different pieces of the audiovisual content are mixed with different control words, the method for each of the segments comprises: • transmitting at least one rights control message to a security The processor, each rights control message contains: 10 • a password of the control word, which is required by the code to decode at least a portion of the segment of the audiovisual content; and • when the rights control message is used to obtain the content of the audiovisual content When the control word is required for the segment, the table needs to be incremented or decremented by an identifier (C_Id) of the cell; • for the number contained in the following cell, the amount is increased or decremented: Up to the identifier included in the rights control message; • the security processor decoding the control word included in the transmitted rights control message; and 15 transmitting the β decoded control word to a descrambler to solve Mixing at least a portion of the segment of the audiovisual content. 8. If the method of applying for the __, the calculation of the number of views that have occurred includes: 20 judging from the last time the audiovisual content was viewed, the number of orders that have been increased or decremented in the table And 4 different occurrences of the number of views as a function of the result of the reward. 9. The method of claim 1, wherein the calculation of the number of occurrences that have occurred is reduced or increased by a function of the number of times the predetermined segment of the centroid has been increased or decreased: The number in the cell associated with the X segment. 38 200834441 ιο· - A kind of processor, characterized in that it comprises instructions which, when executed by an electronic computer, are executed according to items 1 to 5 and 7 to 9 of the patent application scope. The method of the item. 11 - a type of terminal, read and read - (d), the terminal contains ... · betting material, which contains the recorded digital audiovisual content, the content is finely divided into a plurality of continuous time segments, used to The predetermined order is automatically read; • the audiovisual content is allowed to view an integer; seeing the content - the electronic reader, which can specifically jump back to read a comparison when the audiovisual content has not reached the end Early segment; • The terminal is adapted to: • calculate the number of views that the audiovisual content has occurred; and • prevent any new viewing of the audiovisual content when the number of views that have occurred is greater than or equal to the number of allowed viewings , otherwise allowing a new viewing of the audiovisual content; the terminal is characterized in that it includes a "table" containing the same number of singles as the one piece of time #1, each of which is in a one-to-one manner One of the individual segments in I is associated with each cell, and each cell is adapted to the packet s number. Another feature is that the terminal system is suitable for: ± • When a segment of the multimedia content is received by the electronic When the machine is read, used to score or deduct a predetermined level from the number contained in the cell associated with the segment; and • to use each of the orders stored in the form The number in the person, counts the number of views that have occurred. 39